Extruding apparatus



M NAMEE DZNG APPARATUS I Nov. 24, 1953 -2 Sheets-Sheet 1 Filed p il 24,1951 Nov. 24, 1953 o. A. MGNAMEE 2,659,932

EXTRUDING APPARATUS Filed April 24, 1951 2 sp ts-sheet 2 lawentor: flmwA. M/VQML E,

place by means of a die holder 36 threaded into an opening 38 in the diehead 2. The exit end of the male die 24 is rounded at 39 and tapersinwardly toward the exit end. The female die is provided with asimilarly tapered portion 40 adjacent its entry end. The female and maledies are spaced apart to provide a side opening or orifice 42 betweenthe portions 39 and 40. The female die 34 is provided with an axialopening M having a size and shape substantially the same as that of thefinished cable. The die head 2 is provided with an opening 42 of such asize that insulating material R can completely surround the die holderIS.

The operation of my device is as follows:

The cables and strand S are pulled through the dies 24 and 34 in theusual manner and the screw 8 is rotated to feed insulating material Rthrough the openings 30 and the orifice 42. Insulating material R isextruded around the ground strand S through the opening 28, the exit endof which determines the thickness of insulating material around thestrand S. As the conductors C and strand S pass from the exit end ofmale die 24 insulating material R. is extruded around the entireassembly through the orifice t2 and the die opening 44.

In making a twin conductor cable without the ground strand S, theinsulating material R will be extruded between the conductors C in thesame manner as described above to form the bridge wall. In the samemanner the insulating material may be extruded into valleys betweenconductors in any type of cable.

While one embodiment of my invention has been shown and described, itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the following claims.

I claim:

1. Apparatus for extruding an insulating material around a pair ofconductors having a substantially rectangular ground strand therebetweento form a cable, which comprises a male die, said male die having twospaced apart substantially circular axial openings therethrough one foreach of said conductors and a substantially rectangular axial centralopening between the circular openings for receiving the ground strand,said male die having a side opening therein extending outwardly andrearwardly from each side edge of said central opening for receivinginsulating material, each of said side openings being disposed at anacute angle to the axial openings in the male die, a female diesurrounding the exit end of said male die and spaced therefrom toprovide an orifice for the insulating material, said female die havingan axial opening therein for receiving the conductors, ground strand andinsulating material, said female die extending beyond the exit end ofsaid male die, the exit end of the opening in the female die having asize and shape substantially the same as that of the finished cable, andmeans for feeding insulating material around said male die from theentry end thereof through said side openings and orifice.

2. Apparatus for extruding an insulating material around a pair ofconductors having a substantially rectangular ground strand therebetweento form a cable, which comprises an extruding head having an openingtherein for receiving said insulating material and axially alignedthreaded openings communicating with said first named opening, anelongated male die holder threaded into one of said threaded openingsand extending through said first named opening toward the second of saidthreaded openings, said die holder having an axial opening therein forreceiving said conductors and ground strand, a male die supported by theend of said die holder adjacent the second threaded opening, said maledie having two spaced apart substantially circular axial openingstherethrough one for each of said conductors and a substantiallyrectangular axial central opening between the circular openings for theground strand, said male die having a side opening therein extend ingoutwardly and rearwardly from each side edge of said central opening forreceiving insulating material, each of said side openings being disposedat an acute angle to the axial openings in the male die, a female diethreaded into the second threaded opening, said female die surroundingthe exit end of said male die and spaced therefrom to provide an orificefor the insulating material, said female die having an axial openingtherein for receiving the conductors, ground strand and insulatingmaterial, said female die extending beyond the exit end of said maledie, the exit end of the opening in female die having a size and shapesubstantially the same as that of the finished cable, and means forfeeding insulating material from said first named opening through saidside openings and orifice.

3. Apparatus for extruding an insulating material around a multipleconductor cable comprising a male die having an axial opening therein Lfor each of the conductors to guide their passage therethrough, asmaller axial opening be tween adjacent axial openings, said male diehaving a side opening therein extending outwardly and rearwardly fromeach of said smaller openings for receiving insulating material, eachor" said side openings being disposed at an acute angle to the axialopenings in the male die, a female die surrounding the exit end of saidmale die and spaced therefrom to provide an outwardly and rearwardlyextending opening for the insulating material, said female die having anaxial opening therein for receiving the multiple conductor cable andinsulating material, said female die extending beyond the exit end ofsaid male die, the exit end of the opening in the female die having asize and shape substantially the same as that of the finished cable, andmeans for feeding insulating material around said male die from theentry end thereof through said outwardly and rearwardly extendingopenings.

4. Apparatus for extruding an insulating material around a multipleconductor cable comprising an extruding head having an opening thereinfor receiving said insulating material and axially aligned threadedopenings communicating with said first named opening, an elongated maledie holder threaded into one of said threaded openings and extendingthrough said first named opening toward the second of said threaded openings, said die holder having an axial opening.

therein for receiving said conductors, a male die supported by the endof said die holder adjacent the second threaded opening, said male diehaving an axial opening therein for each of the conductors to guidetheir passage therethrough and a smaller axial opening between adjacentaxial openings, said male die having a side opening therein extendingoutwardly and rearwardly from each of said smaller openings forreceiving 7 insulating material, each of said side openings beingdisposed at an acute angle to the axial openings in the male die, afemale die threaded -into the second threaded opening, said female ingtherein for receiving the multiple conductor cable and insulatingmaterial, said female die extending beyond the exit end of said maledie, the exit end of the opening in the female die having a size andshape substantially the same as that of the finished cable, and meansfor feeding insulating material from said first named opening throughsaid side openings and orifice.

OWEN A. McNAMEE.

References Cited in the file of this patent UNITED STATES PATENTS NumberNumber Name Date Van Gestel Apr. 8, 1888 Flint July 15, 1924 AlderferJune 28, 1927 Trebes May 24, 1932 Shaw et a1. Dec. 11, 1934 Wermine Feb.28, 1939 Grana Sept. 12, 1950 FOREIGN PATENTS Country Date Great BritainApr. 4, 1941 Switzerland Mar. 16, 1942 Canada Mar. 8, 1949

